Ok:) tips I would like to share.
Fityk is great because:
- tool is free and works on different platforms (Windows, Mac OS?, Linux)
- program allows use of user defined models
- fitted models can be saved
Of course I miss features of:
- saving color of lines, size of points for different functions used in the model
- custom formating of the output (i errors)
- using constrains
- changing of visual baseline (in Fityk it is fixed to 0, all shapes are plotted relative to it) to some user defined constant value.
- estimating errors of the fitted model: s=max(y-F(x)). We set values for the standard deviation as a constant value for all points. This value is considered as maximum deviation of experimental points y[n] from the fitted model F(x).
- setting manual constrains, like limiting parameter $param to positive values. For this we need to create another variable, for instance, $dummy and set: $dummy=~{10}; $param=sqrt($dummy^2). This way we define that Fityk may vary the $dummy variable, and $param variable depends linearly on it and is always positive. This trick is very useful if you need to avoid undesirable subtraction/addition of different Gaussian or Lorentz peaks (Spectroscopy, X-ray diffraction). Need to mention, that you have to control both widths/heights of the Lorentz/Gauss.
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